Aryabhatta Knowledge University
Sem. iv 2013 Time 3hr Full marks: 70
FIELD MEASUREMENT (SURVEYING)
Attempt any five questions in which question no 1 is
compulsory
1.
Choose the correct option of the following (any
seven)
(a)
The main principal of surveying is to work
(i)
From part to whole
(ii)
From whole to part
(iii)
From higher level to lower level
(iv)
From lower level to higher level
(b)
The angle of intersection of the two plane
mirrors of an optical square is
(i)
30°
(ii)
45°
(iii)
60°
(iv)
90°
(c)
The allowable length of an offset depends upon
(i)
The degree of accuracy required
(ii)
The method of setting out the perpendiculars and
nature of ground
(iii)
The scale of plotting
(iv)
all of the above
(d)
The correction for sag is
(i)
always positive
(ii)
always subtractive
(iii)
always zero
(iv)
sometimes additive and sometimes subtractive
(e)
Which of the following statements is incorrect ?
(i)
the true meridian at defend places are parallel
to each other
(ii)
the true meridian at any place is not variable
(iii)
the true meridian converges to a point in
northern and southern hemispheres
(iv)
the maps prepared by national survey departments
of any country are based on true meridian
(f)
The most reliable method of plotting a theodolite traverse is
(i)
by consecutive coordinates of station
(ii)
by independent coordinates of each station
(iii)
by plotting included angles and scaling off each
traverse leg
(iv)
by the tangent method of plotting
(g)
the prismatic compass and surveyor’s compass
(i)
give WCB (whole circle bearing ) of a line and
QB (quadrantal bearing)of a line respectively
(ii)
both give QB of a line and WCB of a line
(iii)
both give QB of a line
(iv) both
give WCB of a line
(h)
Which of the following is not the function of
levelling head?
(i)
To support the main part of the instrument
(ii)
To attach the theodolite to the tripod
(iii)
To provide a means for levelling the theodolite
(iv) None
of the above
(i)
The line normal to the plumb line is known as
(i)
Horizontal line
(ii)
Level line
(iii)
Datum line
(iv) Vertical
line
(j)
Which of the following is Lehmann’s rule of
plane tabling?
(i)
The location of the instrument station is always
distant from each of the three rays from the known points in proportion to
their distances
(ii)
When looking in the direction of each of the
given points, the instrument station will be on the right side of one ray and
on the left side of the other ray
(iii)
When the instrument station is outside the
circumscribing circle ,its location is always on the opposite side of the ray
to the most distant point as the intersection of the other two rays
(iv)
None of the above
2.
(a) work differentiate between plane surveying and
geodetic surveying
(b) What do you understand by accuracy and precision?
(c) A 30 m chain was found to be 12 cm too long after chaining a distance of 1750m .It was found to be 23cm too long at the end of day’s
work after chaining a total distance of 3600m . Find the true distance if the
chain was corrected before the commencement of the
3.
(a) What is offset ? What are the points to be
considered while selecting offsets
(b) With neat sketches ,explain any two methods of chaining along a sloping
ground
(c) In chaining a line ,what is the maximum slope (i) in degrees and (ii) as 1 in n , which can be
ignored if the error from the source does not exceed 1 in 1000 ?
4.
(a) Explain the following cases with neat
sketches :
(i)
Obstacles to ranging but not chaining
(ii)
Obstacles to both chaining and ranging
(b) AB is a chain line crossing a
lake , A and B are on the opposite side of a lake. A line AC , 800m long ,is ranged to the right of AB clear of
the lake . Similarly, another line AD , 1000m long ,is ranged to the left of AB
such that the points C , B and D are in the same line . the lengths of BC and BD are 400m and 600 m respectively .if
the chainage at A is 1200m, calculate
the chainage of B
5.
(a) What do you understand by local attraction ? What are the methods for
detecting and eliminating local attraction ?
(b) The following bearings are
observed in running a closed traverse:
|
Line
|
FB
|
BB
|
|
AB
|
71°05’
|
250°20’
|
|
BC
|
110°20’
|
292°35’
|
|
CD
|
161°35’
|
341°45’
|
|
DE
|
220°50’
|
40°05’
|
|
EA
|
300°50’
|
121°10’
|
Determine the correct magnetic bearing of the lines.
6.
(a) Explain how the procedure of reciprocal levelling
eliminates the effect of atmospheric refraction and earth’s curvature as well
as the effect of the line of collimation.
(b) From a running fly levels from a benchmark of RL 183.215 , the
following readings were obtained :
|
BS
|
1.215
|
2.035
|
1.980
|
2.65
|
|
FS
|
0.965
|
3.830
|
0.980
|
|
From the last position of the instrument, five pegs at 20m intervals are
to be set out on a uniform rising gradient of 1 in 40 ; the first peg is to
have an RL of 181.580 .work out the staff readings required for setting the tops of the pegs on
the given gradient
7.
(a) What are temporary adjustments of the
instrument ? Explain in brief. Why is it necessary?
(b) Explain how you would take field observations with a theodolite so as
to eliminate the following:
(i) Error due to eccentricity of verniers
(ii) Error due to non adjustment of line of sight
(iii)
Error due to nonuniform graduation
(iv)
Index error of vertical circle
(v)
Error due to slip
8.
(a) Define the following
(i)
Counter line
(ii)
Contour interval
(iii)
Horizontal equivalent
(b) What are the characteristic
of contour lines?
(c) List the names of methods
employed for solving three-point problem
.Describe any one in detail
9. Write short notes on any four
of the following
(a) Tape correction
(b) Optical square
(c) Diagonal scale
(d) Dumpy level
(e) plane table surveying